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It is an entirely different release of XP so yes, you would need a new key.
Wikipedia wrote:
Microsoft Windows XP Professional x64 Edition released on April 25, 2005 by Microsoft is a variation of the Windows XP operating system for x86-64 personal computers.
We are talking Windows XP Professional x64 Edition here not the commonly confused and unsupported Microsoft Windows XP 64-bit Edition
Why would you want XP Pro 64 Bit, anyway There are many compatibility issues with it...
Unless you have 4GB RAM or more you will see no performance differences
here are some common issues with Windows XP Professional x64 Edition.
* Driver compatibility - some hardware companies have yet to write 64-bit drivers for their products.
* 32-bit (currently most) Windows Explorer extensions fail to work with 64-bit Windows Explorer (due to the fact that 32-bit programs cannot interface with 64-bit in-proc DLLs and vice-versa). An example of this is the inability to install the context-menu options for applications such as zip utilities.
* 16-bit application components cannot run.
* No native support for Type 1 fonts.
* No support for the WPA2 security level for wireless networking until Service Pack 2.
* No hardware specific versions like Tablet PC Edition
* No support for connectivity with the Apple iPhone
The "advantages" are quite trivial...
* Can address more than 4GB memory, most new motherboards support 8GB now
* Is immune against 32bit viruses as most windows files are 64bit
* Uses the Windows Server 2003 Kernel, one of the most stable
* Faster encoding of audio/video when using 64bit compiled programs
* Has access to the extra registers of the x86-64 architecture
Service Pack 2 (SP2) was released on the 12th of March 2007,the good news is...
you don't have to buy a new key just yet - after reading what I posted above, you can actually download a free 120 Day trial of Windows XP Professional x64 Edition
Thank you for your interest in evaluating Windows XP Professional x64 Edition. This trial software allows you to evaluate the product for 120 days. Register to order a CD or to download the trial software.
Download the trial The Windows XP Professional x64 Edition trial software download is available at no charge. After you have completed the download registration process, you will receive an e-mail message with a link to the download page. The download page will include the download file and a product key for the trial software. The file will be in ISO format and must be burned to a CD or DVD before you can install the software on your computer.
he download file is large—over 550 megabytes (MB)—so the download may take considerable time to complete. We recommend downloading the trial software only if you have broadband, ADSL, or other high-speed Internet connections, so you can even order a free trial CD.
I wanted to use it for my new computer (intel core2duo) as I thought it would be better for it but after spending the morning looking on Wikipedia and after reading what you wrote above I don't think it's worth the hassle now.
Thanks for answering my question and thanks for the advice Sam
Also some programs have trouble working with 64 bit Windows. Unless you need tons of RAM I'd recommend too staying away from it. 32 bit is the way to go at least for now....
I ended up trying Vista on my new computer and everything worked except the soundcard and that's down to the HD-Audio error on the Asus board im using so I went back to XP 32bit and everything works fine (apart from the odd freezing).